IMHO The Saudis religious and moral obligations would be to get the Alawite Assad out of power in Syria and put the Sunnis in charge. Then the Alawites and Christians can be persecuted in Syria.
With Assad out, the Iranians (Shiites) will lose an ally in Syria. Next up for the Sunnis, trying to topple Lebanon for another Sunni victory.- tom
At this point, anything is better than what is going on in Syria. Any leader that would use military force on civilian targets should be removed from office and hung.
It’s not like Syria was friendly to the US or Israel. We are not losing an ally like we did with Egypt. Syria and Lebanon are very different than the Gulf and North Africa Arab countries. I’m not sure they would go the hard core Islamic route.